different between visibility vs rvr

English

From Middle French visibilité, from Late Latin visibilitas; equivalent to visible +? -ity.

visibility (countable and uncountable, plural visibilities)

(uncountable) The condition of being visible.
(countable) The degree to which things may be seen.
The visibility from that angle was good.
(programming) The scope within which a variable or function is able to be accessed directly.
(obsolete, rare) Something worthy of being seen; a sight.
- 1791, James Boswell, Life of Johnson, Oxford 2008, p. 658:
  ‘Sir, I have seen all the visibilities of Paris, and around it; but to have formed an acquaintance with the people there, would have required more time than I could stay.’

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